All our preicous gemstones come with a certification of authenticity. The certificate for a preicous gemstone verifies the quality and physical characteristics of each individual gem. It is a report written by a gemologist team and covers aspects of gemstone characteristics such as shape, measurements, carat weight, clarity grade, color grade, cut grade, finish, symmetry, fluorescence and additional information. An official report will also include a proportion diagram to give an exact ratio visual of the gemstone. The three major gemstone grading laboratories in North America are the GIA (Gemological Institute of America), EGL (European Gemological Laboratory) and AGSL (American Gem Society Laboratories).